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10516. Short, R.. 1991. Common root rot of peas incited by Aphanomyces euteiches.. handout at Crops 510 seminar, WSU.Aphanomyces euteiches is often the primary and dominant invading species of a pathogen complex that attacks peas, along with Fusarium, Pythium, Rhizoctonia, and Ascochyta. Aphanomyces causes 16-20 million dollars of crop loss annually in the U.S. The oospores may persist in soil for more than 20 years, making it a difficult disease to eliminate. Control of Aphanomyces demands and integrated approach due to its invasive and pervasive nature. Field sampling can help determine inoculum levels, and crop sequences can be altered. In some cases, a break of five or more years between pea crops is needed to lower inoculum levels for minimal damage. Cultural practices which reduce soil compaction and promote drainage are beneficial. Organic amendments such as crucifer green manure crops have reduced inoculum levels in infested soils. Biological control agents, such as Trichoderma and Pseudomonas, show promise. Breeding for multiple disease resistance is another important strategy.